-/****************/
-/* Truly global */
-/****************/
+/* perlvars.h
+ *
+ * Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
+ * by Larry Wall and others
+ *
+ * You may distribute under the terms of either the GNU General Public
+ * License or the Artistic License, as specified in the README file.
+ *
+ */
+
+/*
+=head1 Global Variables
+These variables are global to an entire process. They are shared between
+all interpreters and all threads in a process. Any variables not documented
+here may be changed or removed without notice, so don't use them!
+If you feel you really do need to use an unlisted variable, first send email to
+L<perl5-porters@perl.org|mailto:perl5-porters@perl.org>. It may be that
+someone there will point out a way to accomplish what you need without using an
+internal variable. But if not, you should get a go-ahead to document and then
+use the variable.
-/* Don't forget to re-run embed.pl to propagate changes! */
+=cut
+*/
+
+/* Don't forget to re-run regen/embed.pl to propagate changes! */
/* This file describes the "global" variables used by perl
* This used to be in perl.h directly but we want to abstract out into
* and how they're initialized.
*
* The 'G' prefix is only needed for vars that need appropriate #defines
- * generated when built with or without EMBED. It is also used to generate
- * the appropriate export list for win32.
- *
- * Avoid build-specific #ifdefs here, like DEBUGGING. That way,
- * we can keep binary compatibility of the curinterp structure */
-
+ * generated in embed*.h. Such symbols are also used to generate
+ * the appropriate export list for win32. */
/* global state */
-PERLVAR(Gcurinterp, PerlInterpreter *)
- /* currently running interpreter */
-#ifdef USE_THREADS
-PERLVAR(Gthr_key, perl_key) /* For per-thread struct perl_thread* */
-PERLVAR(Gsv_mutex, perl_mutex) /* Mutex for allocating SVs in sv.c */
-PERLVAR(Gmalloc_mutex, perl_mutex) /* Mutex for malloc */
-PERLVAR(Geval_mutex, perl_mutex) /* Mutex for doeval */
-PERLVAR(Geval_cond, perl_cond) /* Condition variable for doeval */
-PERLVAR(Geval_owner, struct perl_thread *)
- /* Owner thread for doeval */
-PERLVAR(Gnthreads, int) /* Number of threads currently */
-PERLVAR(Gthreads_mutex, perl_mutex) /* Mutex for nthreads and thread list */
-PERLVAR(Gnthreads_cond, perl_cond) /* Condition variable for nthreads */
-PERLVAR(Gsvref_mutex, perl_mutex) /* Mutex for SvREFCNT_{inc,dec} */
-PERLVARI(Gthreadsv_names,char *, THREADSV_NAMES)
-#ifdef FAKE_THREADS
-PERLVAR(Gcurthr, struct perl_thread *)
- /* Currently executing (fake) thread */
-#endif
-#endif /* USE_THREADS */
-
-PERLVAR(Gninterps, int) /* number of active interpreters */
-
-PERLVAR(Guid, int) /* current real user id */
-PERLVAR(Geuid, int) /* current effective user id */
-PERLVAR(Ggid, int) /* current real group id */
-PERLVAR(Gegid, int) /* current effective group id */
-PERLVAR(Gnomemok, bool) /* let malloc context handle nomem */
-PERLVAR(Gan, U32) /* malloc sequence number */
-PERLVAR(Gcop_seqmax, U32) /* statement sequence number */
-PERLVAR(Gop_seqmax, U16) /* op sequence number */
-PERLVAR(Gevalseq, U32) /* eval sequence number */
-PERLVAR(Gorigenviron, char **)
-PERLVAR(Gorigalen, U32)
-PERLVAR(Gpidstatus, HV *) /* pid-to-status mappings for waitpid */
-PERLVARI(Gmaxo, int, MAXO) /* maximum number of ops */
-PERLVAR(Gosname, char *) /* operating system */
-PERLVARI(Gsh_path, char *, SH_PATH)/* full path of shell */
-PERLVAR(Gsighandlerp, Sighandler_t)
-
-PERLVAR(Gxiv_arenaroot, XPV*) /* list of allocated xiv areas */
-PERLVAR(Gxiv_root, IV *) /* free xiv list--shared by interpreters */
-PERLVAR(Gxnv_root, double *) /* free xnv list--shared by interpreters */
-PERLVAR(Gxrv_root, XRV *) /* free xrv list--shared by interpreters */
-PERLVAR(Gxpv_root, XPV *) /* free xpv list--shared by interpreters */
-PERLVAR(Ghe_root, HE *) /* free he list--shared by interpreters */
-PERLVAR(Gnice_chunk, char *) /* a nice chunk of memory to reuse */
-PERLVAR(Gnice_chunk_size, U32) /* how nice the chunk of memory is */
-
-#ifdef PERL_OBJECT
-PERLVARI(Grunops, runops_proc_t, FUNC_NAME_TO_PTR(RUNOPS_DEFAULT))
-#else
-PERLVARI(Grunops, runops_proc_t *, RUNOPS_DEFAULT)
-#endif
-
-PERLVAR(Gtokenbuf[256], char)
-PERLVAR(Gna, STRLEN) /* for use in SvPV when length is
- Not Applicable */
-
-PERLVAR(Gsv_undef, SV)
-PERLVAR(Gsv_no, SV)
-PERLVAR(Gsv_yes, SV)
-#ifdef CSH
-PERLVARI(Gcshname, char *, CSH)
-PERLVAR(Gcshlen, I32)
-#endif
-
-PERLVAR(Glex_state, U32) /* next token is determined */
-PERLVAR(Glex_defer, U32) /* state after determined token */
-PERLVAR(Glex_expect, expectation) /* expect after determined token */
-PERLVAR(Glex_brackets, I32) /* bracket count */
-PERLVAR(Glex_formbrack, I32) /* bracket count at outer format level */
-PERLVAR(Glex_fakebrack, I32) /* outer bracket is mere delimiter */
-PERLVAR(Glex_casemods, I32) /* casemod count */
-PERLVAR(Glex_dojoin, I32) /* doing an array interpolation */
-PERLVAR(Glex_starts, I32) /* how many interps done on level */
-PERLVAR(Glex_stuff, SV *) /* runtime pattern from m// or s/// */
-PERLVAR(Glex_repl, SV *) /* runtime replacement from s/// */
-PERLVAR(Glex_op, OP *) /* extra info to pass back on op */
-PERLVAR(Glex_inpat, OP *) /* in pattern $) and $| are special */
-PERLVAR(Glex_inwhat, I32) /* what kind of quoting are we in */
-PERLVAR(Glex_brackstack,char *) /* what kind of brackets to pop */
-PERLVAR(Glex_casestack, char *) /* what kind of case mods in effect */
-
-/* What we know when we're in LEX_KNOWNEXT state. */
-PERLVAR(Gnextval[5], YYSTYPE) /* value of next token, if any */
-PERLVAR(Gnexttype[5], I32) /* type of next token */
-PERLVAR(Gnexttoke, I32)
-
-PERLVAR(Glinestr, SV *)
-PERLVAR(Gbufptr, char *)
-PERLVAR(Goldbufptr, char *)
-PERLVAR(Goldoldbufptr, char *)
-PERLVAR(Gbufend, char *)
-PERLVARI(Gexpect,expectation, XSTATE) /* how to interpret ambiguous tokens */
-
-PERLVAR(Gmulti_start, I32) /* 1st line of multi-line string */
-PERLVAR(Gmulti_end, I32) /* last line of multi-line string */
-PERLVAR(Gmulti_open, I32) /* delimiter of said string */
-PERLVAR(Gmulti_close, I32) /* delimiter of said string */
-
-PERLVAR(Gerror_count, I32) /* how many errors so far, max 10 */
-PERLVAR(Gsubline, I32) /* line this subroutine began on */
-PERLVAR(Gsubname, SV *) /* name of current subroutine */
-
-PERLVAR(Gmin_intro_pending, I32) /* start of vars to introduce */
-PERLVAR(Gmax_intro_pending, I32) /* end of vars to introduce */
-PERLVAR(Gpadix, I32) /* max used index in current "register" pad */
-PERLVAR(Gpadix_floor, I32) /* how low may inner block reset padix */
-PERLVAR(Gpad_reset_pending, I32) /* reset pad on next attempted alloc */
-
-PERLVAR(Gthisexpr, I32) /* name id for nothing_in_common() */
-PERLVAR(Glast_uni, char *) /* position of last named-unary op */
-PERLVAR(Glast_lop, char *) /* position of last list operator */
-PERLVAR(Glast_lop_op, OPCODE) /* last list operator */
-PERLVAR(Gin_my, bool) /* we're compiling a "my" declaration */
-PERLVAR(Gin_my_stash, HV *) /* declared class of this "my" declaration */
-#ifdef FCRYPT
-PERLVAR(Gcryptseen, I32) /* has fast crypt() been initialized? */
-#endif
-
-PERLVAR(Ghints, U32) /* pragma-tic compile-time flags */
-
-PERLVAR(Gdo_undump, bool) /* -u or dump seen? */
-PERLVAR(Gdebug, VOL U32) /* flags given to -D switch */
-
-
-#ifdef OVERLOAD
-
-PERLVAR(Gamagic_generation, long)
-
-#endif
-
-#ifdef USE_LOCALE_COLLATE
-PERLVAR(Gcollation_ix, U32) /* Collation generation index */
-PERLVAR(Gcollation_name,char *) /* Name of current collation */
-PERLVARI(Gcollation_standard, bool, TRUE)
- /* Assume simple collation */
-PERLVAR(Gcollxfrm_base, Size_t) /* Basic overhead in *xfrm() */
-PERLVARI(Gcollxfrm_mult,Size_t, 2) /* Expansion factor in *xfrm() */
-#endif /* USE_LOCALE_COLLATE */
-
-#ifdef USE_LOCALE_NUMERIC
-
-PERLVAR(Gnumeric_name, char *) /* Name of current numeric locale */
-PERLVARI(Gnumeric_standard, bool, TRUE)
- /* Assume simple numerics */
-PERLVARI(Gnumeric_local, bool, TRUE)
- /* Assume local numerics */
-
-#endif /* !USE_LOCALE_NUMERIC */
-
-/* constants (these are not literals to facilitate pointer comparisons) */
-PERLVARIC(GYes, char *, "1")
-PERLVARIC(GNo, char *, "")
-PERLVARIC(Ghexdigit, char *, "0123456789abcdef0123456789ABCDEFx")
-PERLVARIC(Gpatleave, char *, "\\.^$@dDwWsSbB+*?|()-nrtfeaxc0123456789[{]}")
-
-PERLVAR(Gspecialsv_list[4],SV *) /* from byterun.h */
+#if defined(USE_ITHREADS)
+PERLVAR(G, op_mutex, perl_mutex) /* Mutex for op refcounting */
+#endif
+PERLVARI(G, curinterp, PerlInterpreter *, NULL)
+ /* currently running interpreter
+ * (initial parent interpreter under
+ * useithreads) */
+#if defined(USE_ITHREADS)
+PERLVAR(G, thr_key, perl_key) /* key to retrieve per-thread struct */
+#endif
+
+/* XXX does anyone even use this? */
+PERLVARI(G, do_undump, bool, FALSE) /* -u or dump seen? */
+
+#ifndef PERL_USE_SAFE_PUTENV
+PERLVARI(G, use_safe_putenv, bool, TRUE)
+#endif
+
+#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS)||defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
+PERLVARI(G, sig_handlers_initted, int, 0)
+#endif
+#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
+PERLVARA(G, sig_ignoring, SIG_SIZE, int)
+ /* which signals we are ignoring */
+#endif
+#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
+PERLVARA(G, sig_defaulting, SIG_SIZE, int)
+#endif
+
+/* XXX signals are process-wide anyway, so we
+ * ignore the implications of this for threading */
+#ifndef HAS_SIGACTION
+PERLVARI(G, sig_trapped, int, 0)
+#endif
+
+#ifndef PERL_MICRO
+/* If Perl has to ignore SIGPFE, this is its saved state.
+ * See perl.h macros PERL_FPU_INIT and PERL_FPU_{PRE,POST}_EXEC. */
+PERLVAR(G, sigfpe_saved, Sighandler_t)
+PERLVARI(G, csighandlerp, Sighandler_t, Perl_csighandler)
+ /* Pointer to C-level sighandler */
+#endif
+
+/* This is constant on most architectures, a global on OS/2 */
+#ifdef OS2
+PERLVARI(G, sh_path, char *, SH_PATH) /* full path of shell */
+#endif
+
+#ifdef USE_PERLIO
+
+# if defined(USE_ITHREADS)
+PERLVAR(G, perlio_mutex, perl_mutex) /* Mutex for perlio fd refcounts */
+# endif
+
+PERLVARI(G, perlio_fd_refcnt, int *, 0) /* Pointer to array of fd refcounts. */
+PERLVARI(G, perlio_fd_refcnt_size, int, 0) /* Size of the array */
+PERLVARI(G, perlio_debug_fd, int, 0) /* the fd to write perlio debug into, 0 means not set yet */
+#endif
+
+#ifdef HAS_MMAP
+PERLVARI(G, mmap_page_size, IV, 0)
+#endif
+
+#if defined(USE_ITHREADS)
+PERLVAR(G, hints_mutex, perl_mutex) /* Mutex for refcounted he refcounting */
+PERLVAR(G, locale_mutex, perl_mutex) /* Mutex for setlocale() changing */
+
+# ifdef HAS_NEWLOCALE
+PERLVAR(G, C_locale_obj, locale_t)
+# endif
+
+#endif
+
+#ifdef DEBUGGING
+PERLVARI(G, watch_pvx, char *, NULL)
+#endif
+
+/*
+=for apidoc AmU|Perl_check_t *|PL_check
+
+Array, indexed by opcode, of functions that will be called for the "check"
+phase of optree building during compilation of Perl code. For most (but
+not all) types of op, once the op has been initially built and populated
+with child ops it will be filtered through the check function referenced
+by the appropriate element of this array. The new op is passed in as the
+sole argument to the check function, and the check function returns the
+completed op. The check function may (as the name suggests) check the op
+for validity and signal errors. It may also initialise or modify parts of
+the ops, or perform more radical surgery such as adding or removing child
+ops, or even throw the op away and return a different op in its place.
+
+This array of function pointers is a convenient place to hook into the
+compilation process. An XS module can put its own custom check function
+in place of any of the standard ones, to influence the compilation of a
+particular type of op. However, a custom check function must never fully
+replace a standard check function (or even a custom check function from
+another module). A module modifying checking must instead B<wrap> the
+preexisting check function. A custom check function must be selective
+about when to apply its custom behaviour. In the usual case where
+it decides not to do anything special with an op, it must chain the
+preexisting op function. Check functions are thus linked in a chain,
+with the core's base checker at the end.
+
+For thread safety, modules should not write directly to this array.
+Instead, use the function L</wrap_op_checker>.
+
+=cut
+*/
+
+#if defined(USE_ITHREADS)
+PERLVAR(G, check_mutex, perl_mutex) /* Mutex for PL_check */
+#endif
+#ifdef PERL_GLOBAL_STRUCT
+PERLVAR(G, ppaddr, Perl_ppaddr_t *) /* or opcode.h */
+PERLVAR(G, check, Perl_check_t *) /* or opcode.h */
+PERLVARA(G, fold_locale, 256, unsigned char) /* or perl.h */
+#endif
+
+#ifdef PERL_NEED_APPCTX
+PERLVAR(G, appctx, void*) /* the application context */
+#endif
+
+#if defined(HAS_TIMES) && defined(PERL_NEED_TIMESBASE)
+PERLVAR(G, timesbase, struct tms)
+#endif
+
+/* allocate a unique index to every module that calls MY_CXT_INIT */
+
+#ifdef PERL_IMPLICIT_CONTEXT
+# ifdef USE_ITHREADS
+PERLVAR(G, my_ctx_mutex, perl_mutex)
+# endif
+PERLVARI(G, my_cxt_index, int, 0)
+#endif
+
+/* this is currently set without MUTEX protection, so keep it a type which
+ * can be set atomically (ie not a bit field) */
+PERLVARI(G, veto_cleanup, int, FALSE) /* exit without cleanup */
+
+/*
+=for apidoc AmUx|Perl_keyword_plugin_t|PL_keyword_plugin
+
+Function pointer, pointing at a function used to handle extended keywords.
+The function should be declared as
+
+ int keyword_plugin_function(pTHX_
+ char *keyword_ptr, STRLEN keyword_len,
+ OP **op_ptr)
+
+The function is called from the tokeniser, whenever a possible keyword
+is seen. C<keyword_ptr> points at the word in the parser's input
+buffer, and C<keyword_len> gives its length; it is not null-terminated.
+The function is expected to examine the word, and possibly other state
+such as L<%^H|perlvar/%^H>, to decide whether it wants to handle it
+as an extended keyword. If it does not, the function should return
+C<KEYWORD_PLUGIN_DECLINE>, and the normal parser process will continue.
+
+If the function wants to handle the keyword, it first must
+parse anything following the keyword that is part of the syntax
+introduced by the keyword. See L</Lexer interface> for details.
+
+When a keyword is being handled, the plugin function must build
+a tree of C<OP> structures, representing the code that was parsed.
+The root of the tree must be stored in C<*op_ptr>. The function then
+returns a constant indicating the syntactic role of the construct that
+it has parsed: C<KEYWORD_PLUGIN_STMT> if it is a complete statement, or
+C<KEYWORD_PLUGIN_EXPR> if it is an expression. Note that a statement
+construct cannot be used inside an expression (except via C<do BLOCK>
+and similar), and an expression is not a complete statement (it requires
+at least a terminating semicolon).
+
+When a keyword is handled, the plugin function may also have
+(compile-time) side effects. It may modify C<%^H>, define functions, and
+so on. Typically, if side effects are the main purpose of a handler,
+it does not wish to generate any ops to be included in the normal
+compilation. In this case it is still required to supply an op tree,
+but it suffices to generate a single null op.
+
+That's how the C<*PL_keyword_plugin> function needs to behave overall.
+Conventionally, however, one does not completely replace the existing
+handler function. Instead, take a copy of C<PL_keyword_plugin> before
+assigning your own function pointer to it. Your handler function should
+look for keywords that it is interested in and handle those. Where it
+is not interested, it should call the saved plugin function, passing on
+the arguments it received. Thus C<PL_keyword_plugin> actually points
+at a chain of handler functions, all of which have an opportunity to
+handle keywords, and only the last function in the chain (built into
+the Perl core) will normally return C<KEYWORD_PLUGIN_DECLINE>.
+
+=cut
+*/
+
+PERLVARI(G, keyword_plugin, Perl_keyword_plugin_t, Perl_keyword_plugin_standard)
+
+PERLVARI(G, op_sequence, HV *, NULL) /* dump.c */
+PERLVARI(G, op_seq, UV, 0) /* dump.c */
+
+#ifdef USE_ITHREADS
+PERLVAR(G, dollarzero_mutex, perl_mutex) /* Modifying $0 */
+#endif
+
+/* Restricted hashes placeholder value.
+ In theory, the contents are never used, only the address.
+ In practice, &PL_sv_placeholder is returned by some APIs, and the calling
+ code is checking SvOK(). */
+
+PERLVAR(G, sv_placeholder, SV)
+
+#if defined(MYMALLOC) && defined(USE_ITHREADS)
+PERLVAR(G, malloc_mutex, perl_mutex) /* Mutex for malloc */
+#endif
+PERLVARI(G, hash_seed_set, bool, FALSE) /* perl.c */
+PERLVARA(G, hash_seed, PERL_HASH_SEED_BYTES, unsigned char) /* perl.c and hv.h */
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